Distance from point to plane

what i did was i multipled the variables in the plane by their corresponding variables in the point, and then divided that answer by the distance or magnitude of the plane. I got 611.1906 but the computer keep saying that this is not the correct value. Anyone has an alternative solution? Thanks.

what i did was i multipled the variables in the plane by their corresponding variables in the point, and then divided that answer by the distance or magnitude of the plane. <<< what exactly is this? I got 611.1906 but the computer keep saying that this is not the correct value. Anyone has an alternative solution? Thanks.

I assume that you calculated:

The negantive sign of d indicates that the given point and the origin are on different sides of the plane.